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The distance between the optical centre of a lens and its principal focus is given a specific name. What is this distance called?
ARadius of curvature
BAperture diameter
CFocal length
DPrincipal axis
Answer & Solution
Correct answer: C. Focal length
1. By definition, the distance between the optical centre and the principal focus is the focal length (f).
2. Radius of curvature is the radius of the sphere forming a surface, not this distance.
3. So the focal length is the correct term.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 7 "Lenses", p.90_
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